Solved Anna University Question Papers (Reg 2013 / Jun 2015)

Solved Anna University Question Papers

B.E./B.TECH. DEGREE EXAMINATION - May/June 2015

Third Semester

Mechanical Engineering

ME 6302-MANUFACTURING TECHNOLOGY-I

(Common to Industrial Engineering and Industrial Engineering and Management) and Mechanical and Automation Engineering)

Time: Three hours      Maximum: 100 Marks

(Regulation 2013)

Answer ALL questions

Part A - (10 x 2 = 20 Marks)

1. List the different types of patterns.

1. Solid or single piece pattern

2. Split pattern

3. Loose piece pattern

4. Match plate pattern

5. Sweep pattern

6. Skeleton pattern

7. Segmental pattern

8. Shell pattern.

2. Write the applications of core prints.

Core prints are used to make holes in engine blocks, gears and pulleys.

3. Name the various causes for the defect porosity in welding.

Porosity is caused by improper gas shielding, moisture in the electrode, incorrect welding technique, improper cleaning of weld surface, sulfur in weld metal or surface contaminants. They occur mainly due to entrapped gases. Presence of gases such as oxygen, nitrogen and hydrogen in the solidifying metal produces porosity.

4. Write the difference between brazing and soldering.

5. What are the various forming processes?

1. Forging

2. Bending

3. Drawing

4. Squeezing

5. Embossing and

6. Nibbling

6. Name the various defects in parts produced by drawing.

1. Internal cracking

2. Surface defect

7. How are sheet metal operations classified and what are they?

Sheet metal processes are classified as follows:

(i) Shearing process 

(a) Punching

(b) Blanking

(c) Perforating

(d) Parting

(e) Notching

(f) Lancing.

(ii) Forming process

(a) Bending

(b) Stretching

(c) Drawing and

(d) Roll forming.

(iii) Finishing process.

8. What is flanging?

Flanging is a process of bending the edges of sheet metals to 90°. It is also called edge bending or wiping-die bending.

9. Define polyaddition.

Polyaddition is a process in which many monomers are bonded together via rearrangement of bonds without the loss of any atom or molecule under specific conditions of heat, pressure, and/or the presence of a catalyst.

10. Write short notes on the application of plastics.

Applications of plastics in different domains are listed below:

Part B - (5 x 16 = 80 Marks)

11. (a) (i) Explain the properties required for moulding sand.

Refer chapter 1.8.3 in Page 1.19.

(ii) Explain the preparation of moulding sand process.

Refer chapter 1.8.4 in Page 1.21.

Or

(b) (i) Explain any one type of centrifugal casting with a neat diagram.

Refer chapter 1.14.6 in Page 1.83.

(ii) Name any five casting defects and explain the remedies for those defects. 

Refer chapter 1.18 in Page 1.93.

12. (a) (i) Explain the various welding positions with a neat sketch.

Refer chapter 2.18 in Page 2.71.

(ii) Explain the submerged arc welding process with a neat diagram.

Refer chapter 2.8 in Page 2.29.

Or

(b) (i) Explain the arc welding process with a neat sketch.

Refer chapter 2.5 in Page 2.13.

(ii) Describe the ultrasonic welding procèss with a neat diagram.

Refer chapter 2.17 in Page 2.67.

13. (a) (i) Explain hot working and cold working with their advantages and limitations. 

Refer chapter 3.2.1.2 in Page 3.3 for advantages of hot working, chapter 3.2.1.3 in Page 3.3 for limitations of hot working and chapter 3.2.2.2 in Page 3.5 for advantages and limitations of cold working.

(ii) Explain the various forging operations.

Refer chapter 3.6 in Page 3.28.

Or

(b) (i) Describe the ring rolling and thread rolling process.

Refer chapter 3.13.1 in Page 3.57 for ring rolling and chapter 3.13.2 in Page 3.58 for rolling.

(ii) Explain the forward and backward extrusion process.

Refer chapter 3.19.1.1 in Page 3.76 for forward extrusion and chapter 3.19.1.2 in Page 3.77 for backward extrusion processes.

14. (a) (i) Explain the various properties of sheet metal. 

Refer chapter 4.2 in Page 4.3.

(ii) Describe the nibbling and notching operations.

Refer Page 4.13 for nibbling and Page 4.9 for notching.

Or

(b) (i) Explain the different types of bending process.

Refer chapter 4.7.1 in Page 4.23.

(ii) In detail explain the coining and embossing process.

Refer Page 4.12 for embossing and Page 4.11 for coining processes.

15. (a) (i) Write the difference between thermoplastics and thermosetting plastics. 

Refer chapter 5.2.3 in Page 5.9.

(ii) Explain the injection blow moulding process.

Refer chapter 5.4.3 in Page 5.19.

Or

(b) (i) Explain the calendering process.

Refer chapter 5.4.5 in Page 5.24.

(ii) Describe any two types of thermoforming process.

Refer Pages 5.27 & 5.28.